const encrypt = require('./crypto')
const request = require('request')
const queryString = require('querystring')

request.debug = true

const chooseUserAgent = (ua) => {
  const userAgentList = [
    'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1',
    'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1',
    'Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Mobile Safari/537.36',
    'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Mobile Safari/537.36',
    'Mozilla/5.0 (Linux; Android 5.1.1; Nexus 6 Build/LYZ28E) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Mobile Safari/537.36',
    'Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_2 like Mac OS X) AppleWebKit/603.2.4 (KHTML, like Gecko) Mobile/14F89;GameHelper',
    'Mozilla/5.0 (iPhone; CPU iPhone OS 10_0 like Mac OS X) AppleWebKit/602.1.38 (KHTML, like Gecko) Version/10.0 Mobile/14A300 Safari/602.1',
    'Mozilla/5.0 (iPad; CPU OS 10_0 like Mac OS X) AppleWebKit/602.1.38 (KHTML, like Gecko) Version/10.0 Mobile/14A300 Safari/602.1',
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:46.0) Gecko/20100101 Firefox/46.0',
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36',
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/603.2.4 (KHTML, like Gecko) Version/10.1.1 Safari/603.2.4',
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:46.0) Gecko/20100101 Firefox/46.0',
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36',
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/13.10586'
  ]
  let index = 0
  if (typeof(ua) == 'undefined') {
    index = Math.floor(Math.random() * userAgentList.length)
  } else if (ua == 'mobile') {
    index = Math.floor(Math.random() * 7)
  } else if (ua == 'pc') {
    index = Math.floor(Math.random() * 5) + 8
  } else {
    return ua
  }
  return userAgentList[index]
}

const createRequest = (method, url, data, options) => {
  return new Promise((resolve, reject) => {

    let headers = {'User-Agent': chooseUserAgent(options.ua)}
    if (method.toUpperCase() == 'POST') headers['Content-Type'] = 'application/x-www-form-urlencoded'
    if (url.includes('music.163.com')) headers['Referer'] = 'http://music.163.com'
    // headers['X-Real-IP'] = '118.88.88.88'

    if (typeof(options.cookie) === 'object') {
      headers['Cookie'] = Object.keys(options.cookie).map(key => (encodeURIComponent(key) + '=' + encodeURIComponent(options.cookie[key]))).join('; ')
    } else if (options.cookie) {
      headers['Cookie'] = options.cookie
    }

    if (options.crypto == 'weapi') {
      let csrfToken = (headers['Cookie'] || '').match(/_csrf=([^(;|$)]+)/)
      data.csrf_token = (csrfToken ? csrfToken[1] : '')
      data = encrypt.weapi(data)
      url = url.replace(/\w*api/, 'weapi')
    }
    else if (options.crypto == 'linuxapi') {
      data = encrypt.linuxapi({'method': method, url: url.replace(/\w*api/, 'api'), 'params': data})
      headers['User-Agent'] = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36'
      url = 'http://music.163.com/api/linux/forward'
    }

    const answer = {status: 500, body: {}, cookie: []}
    request(
      {method: method, url: url, headers: headers, body: queryString.stringify(data), proxy: options.proxy},
      (err, res, body) => {
        if (err) {
          answer.status = 502
          answer.body = {code: 502, msg: err.stack}
          reject(answer)
        }
        else {
          answer.cookie = (res.headers['set-cookie'] || []).map(x => x.replace(/\s*Domain=[^(;|$)]+;*/, ''))
          try {
            answer.body = JSON.parse(body)
            answer.status = answer.body.code || res.statusCode
          }
          catch (e) {
            answer.body = body
            answer.status = res.statusCode
          }
          answer.status = (100 < answer.status && answer.status < 600) ? answer.status : 400
          if (answer.status == 200) {
            resolve(answer)
          } else {
            reject(answer)
          }
        }
      }
    )
  })
}

module.exports = createRequest
